Ok i had the same problem when i first started this hobby.

Ok what i did to cure this was as follows.. Sounds like your engine is flooded

1) Remove the glow plug from the engine...... take it off completely (dont loose the washer)
2) Use the starter to turn the engine, watch your eyes as this will blow any fuel out of the engine, or just turn the plane on its side and let it drip out of the exhaust.
3) Reconnect the glow plug.
4) If your using an electric starter, thiers not much point in primming the engine as an electric starter will pull the fuel through easily by itself.
5) Attach the glow plug heater.
5) Put starter on nose cone and hold tight and start it, keep it held on tight untill the engine fires.
6) If it still wont start check your glow plug is fully charged as well as your electric starter.
7) Also try putting your finger over the hole on the exausht when starting, this sometimes works for me.

The engine should get easier to start once its run it, hope thats some help and good luck.................
Never give up this is a great hobby and a very addictive one, and RC Universe it probably the best thing youve done so far, ALOT of ppl here are full of excellent advice that will be able to help you.